Eric,
I won't argue semantics with you. Imagine you are in a driving rain and can only see a short distance. You are in heavy traffic and can't get to the side of the road.. Cars around you start turning on their flashers while they are still moving. Now you don't know if they are stopped and you are about to plow into them.. You tap your brakes and risk being rear ended. It was a very scary position. That is my point.
If the vis is good and you are moving slowly, yeah maybe. Not in a driving rain with bad vis.. If it is that bad , get off the roadway and flash away.